Gear-pump.



G. W. DUNHAM.

GEAR PUMP.

APPLICATION FILED OCT. I6. I914 1,1 1,037., Patented Nov. 23, 1915.

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WITNESSES: INVENTOR A TTOR/VEYS g By W Mercer.

enonen w. DUNHAM, or nnraorr, MICHIGAN, ASSIGNOR T0 ormmunns MOTOR"COMPANY, or DETROIT, MICHIGAN, a CORPORATION or MICHIGAN.

GEAR-PUMP.

Specification of Letters Patent.

Patented Nov. as, rare.

Application filed October 16, 1914. seiii No. 866,955.

To all whom it may concern Be it known that I,. GEORGE W. DUNHAM, acitizen of the United States of America,

, residing at Detroit, in the county of Wayne and State of Michigan,have invented certain new and useful Improvements in Gear- Pumps, ofwhich the following is a specification, reference being had therein tothe accompanying drawings. l

The invention relates to rotary pumps, and it is the object of theinvention to obtain a construction which will operate without primingand which maybe arranged above the level of the tank or receptacle fromwhich the liquid is drawn. j

More particularly it is an object to obtain a construction which may beusedin a 1nbricating system for engines or other mechanism and which isoperative in any position of attachment. I In the drawings: Figure 1 isa diagram showing my lubricating system with'my improved pump therein;and Fig. 2 is an elevation of the pump with the front plate removed A Asshown, the rotary pump is oftheinter meshing gear'type, in-which A andB. are two intermeshing gears, and C is a casing recessed to receivesaid gears. This. casing has segmental walls D and D arranged close tothe periphery ofthe gear, wheels and preferably extending-,substantially half the circumference thereof. At opposite sides'ofthewheels the recess is enlarged to form chambers 'E and Econnectedn'espectivelyto the inlet and outlet conduits for the pump.

With the construction as thus far dey scribed, when the pump is arrangedbelow the level of the receptacle from which the liquid is drawn, theinlet chamber E will be filled with liquid, which will fill the clear- Tance spaces between the teeth of the gears so as to seal or prime thepump. On the other hand, if the pump is arranged above the levelof thetank the liquid will not initially fill the chamber E and therefore willnot prime or seal the pump. Inasmuch as the clear- I ances are'toolarge'forthe pump to propel air it cannot be started until liquid isintro- V I l O. -E. GREGORY, I

duced for priming.

avoided the difiicultyabove noted by so arranging the inlet and outletconnections to to a point near the top thereof. This will I prevent thedraining of the liquid 'out from either of the chambers and willmaintain at 'all times a sufficient quantity to seal the pump. Inoperation, the liquid in the chamber E willbe carried around in thepockets between the gear teeth and the segmental walls D and I)" to thechamber E, and this will create a partial vacuum. in the chamber E andthe lifting of the liquid by atmospheric pressure. Even where the supplyof liquid is exhausted the pump cannot completely drain the chambers E.and E, as

there will always remain a volume of liquid substantially equal to thecapacity of one of the chambers, which will be sufiicient to seal thepump for further operation.

Consequently the pump will always be operative 7 and can be arranged atany convenient point in the system withoutregard to the level of theliquid supply.

. What I claim as my invention is 1-. A gear pump, comprisingintermeshing gears, a casing recessed to receive the same and to formseparate inlet and outlet cham bers on opposite sides thereof,'and'inletand outlet conduits extending into said chem:

bers to trap a quantity of liquid therein to {seal oneof'said gears.

2. A gear pump, comprlsing intermesh-mg gears, a casing surrounding-thesame and forming inlet and outlet-chambers on opposite sides thereof,and mlet and outlet conduitsextending upward through the bottom of saidchambers to a pointadjacent to the top thereof to trap a quantity ofliquid there to seal one .of said gears. 3 In testimonywhereof I aflixmy signature in; presence of two witnesses. I

I GEORGE W.

' Witnesses:

J AMES- P. BARRY;

